Question

I have a question, why python numeric calculation is very fast?
for example the below code runs shorter than one second

import  math
print math.factorial(10000)

why???

Answer 1

The math module’s functions are implemented in C:

It provides access to the mathematical functions defined by the C standard.

By using an efficient algorithm in C, you get fast results.

If you are asking why this particular operation is so fast, then see Why is math.factorial much slower in Python 2.x than 3.x? and the C code itself.